Constants of Metallic Oxides at Low Temperatures. 369 



The first experiments were conducted with solutions of various 

 alkaline hydrates taking, to begin with, 5 per cent, aqueous solutions 

 of the hydrates of lithium, sodium, potassium aud rubidium. 

 Following on this, an experiment was tried with a 2 '85 per cent, 

 aqueous solution of caesium hydrate. The details of the observations 

 and results are given in Tables I, II, III, IV, and V. 



I. Dielectric Constant of Lithium Hydrate (LHO). 



(5 per cent, solution in water.) 



Corrected galvanometer deflection when the condenser had air 

 dielectric = 3'03 cm. for 100 volts. 



as 



Temperature 

 in platinum 

 degrees. 



-202-8 



-198-0 



-180-6 



-144-7 



-133-8 



-118-2 



Mean 

 galvanometer 



deflection 

 in centimetres. 



9-30 

 2-00 



2- 20 



3- 20 



4- 10 

 9-85 



Dielectric 

 constant. 



3-00 



3-23 



3-57 



523 



6-74 



16-20 ? 



Observations. 

 Condenser charged to 99 volts. 

 Condenser charged to 19 "8 volts. 



II. Dielectric Constant of Sodium Hydrate (NaHO). 



(5 per cent, solution in water.) 



Corrected galvanometer deflection when the condenser had air 

 dielectric = 4 - 02 cm. for 100 volts. 



as 



Temperature 

 in platinum 

 degrees. 



-201-8 

 -201-7 

 -183-0 

 -174-2 

 -168-2 

 -163-8 



Mean 

 galvanometer 



deflection 

 in centimetres, 



7-70 



7- 72 



8- 40 

 8-27 

 8-15 

 815 



Dielectric, 

 constant. 



133- 



134- 

 145-0 

 143-0 

 141-0 

 141-0 



Observations. 

 Condenser charged to 1'434 volts. 



